in patient care areas.
(D) Capacity of Systems. The essential electrical system shall have adequate capacity to meet the demand for the operation of all functions and equipment to be served by each system and branch.
Feeders shall be sized in accordance with Articles 215 and 220. The generator set(s) shall have sufficient capacity and proper rating to meet the demand produced by the load of the essential electrical system(s) at any given time.
Demand calculations for sizing of the generator set(s) shall be based on any of the following:
(1) Prudent demand factors and historical data
(2) Connected load
(3) Feeder calculation procedures described in Article
220
(4) Any combination of the above
The sizing requirements in 700.5 and 701.6 shall not apply to hospital generator set(s).
(E) Receptacle Identification. The cover plates for the electrical receptacles or the electrical receptacles themselves supplied from the emergency system shall have a distinctive color or marking so as to be readily identifiable. [99:4.4.2.2.4.2(B)]
517.31 Emergency System. Those functions of patient
care depending on lighting or appliances that are connected to the emergency system shall be divided into two mandatory branches: the life safety branch and the critical branch, described in 517.32 and
517.33.
The branches of the emergency system shall be installed and connected to the alternate power source so that all functions specified herein for the emergency system shall be automatically restored to operation within 10 seconds after interruption of the normal source. [99:4.4.2.2.2.1, 4.4.3.1]
517.32 Life Safety Branch. No function other than those listed in 517.32(A) through (H) shall be connected to the life safety branch. The life safety branch of the emergency system shall supply power for the following lighting, receptacles, and equipment.
(A) Illumination of Means of Egress. Illumination of means of egress, such as lighting required for corridors,
passageways, stairways, and landings at exit doors, and all necessary ways of approach to exits. Switching arrangements to transfer patient corridor lighting in hospitals from general illumination circuits to night illumination circuits shall be permitted, provided only one of two circuits can be selected and both circuits cannot be extinguished at the same time.
FPN: See NFPA 101-2006, Life Safety Code, Sections 7.8
and 7.9.
(B) Exit Signs. Exit signs and exit directional signs.
FPN: See NFPA /0/-2OO6, Life Safety Code, Section 7.10.
(C) Alarm and Alerting Systems. Alarm and alerting sys
tems including the following:
(1) Fire alarms
FPN: See NFPA 101-2006, Life Safety Code, Section 9.6
and 18.3.4.
(2) Alarms required for systems used for the piping of
nonflammable medical gases
FPN: See NFPA 99-2005, Standard for Health Care Facili- ties, 4.4.2.2.2.2(3).
|
(3) Mechanical, |
control, and |
other accessories |
|
required |
for |
effective life safety systems operation shall be permit
ted to be connected to the life safety branch.
(D) Communications Systems. Hospital communications systems, where used for issuing instructions during emergency conditions.
(E) Generator Set and Transfer Switch Locations.
Task
illumination battery charger for battery-powered
lighting unit(s) and selected receptacles at the
generator set and essential transfer switch locations.
[99:4.4.2.2.2.2(5)]
(F) Generator Set Accessories. Generator set accessories as